Moles and Grams Converter

Grams ↔ Moles Conversion Tool

Input Fields

Mass of substance

m

g

Enter the mass of the substance in grams

Molar mass

M

g/mol

Enter the molar mass of the substance (e.g. H₂O = 18.015 g/mol)

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Calculate automaticallyIf enabled, the result will update automatically when you change any value.

Your Results

Amount of substance

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Grams to Moles and Moles to Grams Formulas

$$\text{Moles} = \frac{\text{Mass (g)}}{\text{Molar Mass (g/mol)}}$$ $$\text{Mass (g)} = \text{Moles} \times \text{Molar Mass (g/mol)}$$

These formulas allow you to convert mass in grams to amount in moles using the substance’s molar mass, and vice versa.

In chemistry, converting between grams and moles is essential for quantitative analysis. This converter uses the molar mass of a substance to calculate the number of moles from a given mass, or the mass from a given number of moles. It’s an indispensable tool for balancing equations, preparing solutions, and understanding molecular quantities in lab experiments or classroom problems.